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wavefront aberration
To characterize the optical performance of the eye the deviation of the wavefront of a foveal image point from its ideal (spherical) shape (wavefront aberration) was determined.
      
The wavefront aberration is represented mathematically in Zernike polynomials.
      
However, the drastic changes of beam spot, beam intensity profile, modulation transfer function curve and wavefront aberration were not observed.
      
Using zoom optics, an additional aspheric lens surface, and a diffractive optical element together, the wavefront aberration and chromatic aberration are effectively reduced in a broad range of cover-layer thicknesses and wavelength variations.
      
Measurement of Wavefront Aberration of Human Eye Using Talbot Image of Two-Dimensional Grating
      
The Hartmann-Shack (H-S) wavefront sensor is considered to be the most useful wavefront sensor, and a calculation method for wavefront aberration has been established.
      
Maximum wavefront aberration at 249 nm was λ/3 using helium buffer gas, indicating the potential for transmitted beams very close to the diffraction limit.
      
An image of the spot pattern taken with no flow is used to determine the zero wavefront aberration location of every focal spot.
      
Freeform surfaces can also be used to control astigmatism at multiple locations in the field of view and thus reduce wavefront aberration.
      
It should be noted that the constant part of the wavefront aberration can not be measured by a SH wavefront sensor.
      
In studies of the optics of the eye, the concept of wavefront aberration is more appropriate.
      
The S5 and S6 are the fifthand sixth-order components of the wavefront aberration, respectively.
      
The ground layer wavefront aberration can likely be sensed with natural guide stars found over the wide field.
      
The rms wavefront aberration was computed for the subject's mean pupil size measured at each light adaptation level.
      
 

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